Fix broken bsheets.png image in Bitcoin Spreadsheets title

- Move bsheets.png from root to public folder for proper accessibility
- Add image element to hero title with proper styling
- Fix broken image reference that was showing as broken link

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: b0ase

bsheets.png

@@ -28,6 +28,7 @@ const BitcoinSpreadsheetsPage: React.FC = () => {
               <div className="bitcoin-logo-large">₿</div>
             </div>
             <h1 className="hero-title">
+              <img src="/bsheets.png" alt="Bitcoin Spreadsheets" style={{width: '40px', height: '40px', marginRight: '12px', verticalAlign: 'middle'}} />
               Spreadsheets
             </h1>
             <p className="hero-description">